Originally Posted by
GhostRider62
Bike fit isn't as simple as M or L or 6 foot vs 6'1''. In case, Reach and STA are much more important than Stack. For instance, the horizontal distance from my BB to the hoods is 622 mm and from the nose of my saddle to the bars is 597mm. This is a 150mm stem and bars with 125mm reach on a 58 cm frame with stack and reach of 605mm and 396mm. I should be on the 61cm but even still the stem would be 130mm for the same static fit (with a flipped stem). You can force a rider onto a smaller frame without much difficulty, but is it a good idea.
If fit were so simple, we would not have so such a market for bike fitters.
Back to the OP's question, there is one very big difference between the two bikes from my perspective that deserves consideration. The BMC has a 1 degree steeper STA compared to the Giant (in my size), which effectively decreases the Reach by 10-15 mm (guess....I did not do the calculations). Weight forward and move over the crank is fashionable these days......personally, I prefer to have less weight on my hands and would opt for the Giant
What's even more important is how you feel on the said bike. I've had the chance to own both ML and Large TCRs and I do prefer the ML. I was fine with the shorter reach and stack. The only odd thing is the long seat post sticking out because of the top tube angle of a compact frameset. The Teammachine, as well as any other aero-race bike have a ''flatter'' top tube, which makes the whole thing look better IMO.